trace-cmd: Search $TRACE_CMD_PLUGIN_DIR for plugins.

Allows dynamic specification of the plugin directory so that plugins can be
used when the install prefix cannot be predicted, such as when using a
pre-compiled version of trace-cmd with Autotest.

Signed-off-by: David Sharp <dhsharp@google.com>
LKML-Reference: <1285718416-1470-1-git-send-email-dhsharp@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/trace-util.c b/trace-util.c
index 33dbdf0..9e0ceca 100644
--- a/trace-util.c
+++ b/trace-util.c
@@ -771,6 +771,7 @@ void trace_util_load_plugins(struct pevent *pevent, const char *suffix,
 {
         char *home;
         char *path;
+        char *envdir;
 
         if (tracecmd_disable_plugins)
                 return;
@@ -782,7 +783,12 @@ void trace_util_load_plugins(struct pevent *pevent, const char *suffix,
                                             load_plugin, data);
 #endif
 
-        /* Now let the home directory override the system defaults */
+        /* Next let the environment-set plugin directory override the system defaults */
+        envdir = getenv("TRACE_CMD_PLUGIN_DIR");
+        if (envdir)
+                trace_util_load_plugins_dir(pevent, suffix, envdir, load_plugin, data);
+
+        /* Now let the home directory override the environment or system defaults */
         home = getenv("HOME");
 
         if (!home)